I was about to make most of those points, but in terms of meta... there are exactly four gold streams (3 lanes + jungle). They could have people roll for one of those. And no, pickpocket does not count as a real gold stream, any more than GP10s do. I say that as a support Janna main.
Yes, there have been a few crazy strats, like the tournament game with the "jungle" Heimerdinger where they ran a push comp after their opponent picks had boxed the other team into a corner, but that sort of thing requires team coordination, in which case you're not worried about calling roles in the first place.
Matchmaking is a real problem and it sets people up for failure. There are plenty of people who are simply not prepared to jungle or support. Or, heck, depending on their lack of runes, they might not be able to tank, AP or ADC. You can say "you don't really need runes" but when you have little practice already, going in unprepared is only going to make it worse. I've supported without GP10s due to forgetting to change from a full ADC setup in champ select. It's painful, sightstone or no sightstone to be that poor, even if it was hilarious to ignite a poor, unsuspecting enemy Sona for first blood at level 1.
Yes, there have been a few crazy strats, like the tournament game with the "jungle" Heimerdinger where they ran a push comp after their opponent picks had boxed the other team into a corner, but that sort of thing requires team coordination, in which case you're not worried about calling roles in the first place.
Matchmaking is a real problem and it sets people up for failure. There are plenty of people who are simply not prepared to jungle or support. Or, heck, depending on their lack of runes, they might not be able to tank, AP or ADC. You can say "you don't really need runes" but when you have little practice already, going in unprepared is only going to make it worse. I've supported without GP10s due to forgetting to change from a full ADC setup in champ select. It's painful, sightstone or no sightstone to be that poor, even if it was hilarious to ignite a poor, unsuspecting enemy Sona for first blood at level 1.